[Utils] Salvage the debug info of DCE'ed 'and' instructions
Preserve debug info from a dead 'and' instruction with a constant.
Patch by Djordje Todorovic.
Differential Revision: https://reviews.llvm.org/D43163
llvm-svn: 325119
diff --git a/llvm/test/Transforms/InstCombine/debuginfo-variables.ll b/llvm/test/Transforms/InstCombine/debuginfo-variables.ll
index d420346..5c11523 100644
--- a/llvm/test/Transforms/InstCombine/debuginfo-variables.ll
+++ b/llvm/test/Transforms/InstCombine/debuginfo-variables.ll
@@ -87,6 +87,13 @@
ret void
}
+define void @test_and(i64 %A) {
+; CHECK-LABEL: @test_and(
+; CHECK-NEXT: call void @llvm.dbg.value(metadata i64 %A, metadata !72, metadata !DIExpression(DW_OP_constu, 256, DW_OP_and, DW_OP_stack_value)), !dbg !73
+ %1 = and i64 %A, 256
+ ret void
+}
+
; CHECK: !8 = !DILocalVariable(name: "1", scope: !5, file: !1, line: 1, type: !9)
; CHECK: !10 = !DILocalVariable(name: "2", scope: !5, file: !1, line: 2, type: !11)
; CHECK: !12 = !DILocation(line: 2, column: 1, scope: !5)
@@ -124,3 +131,6 @@
; CHECK: !67 = !DILocalVariable(name: "13", scope: !65, file: !1, line: 24, type: !11)
; CHECK: !68 = !DILocation(line: 24, column: 1, scope: !65)
+
+; CHECK: !72 = !DILocalVariable(name: "14", scope: !70, file: !1, line: 26, type: !11)
+; CHECK: !73 = !DILocation(line: 26, column: 1, scope: !70)